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- W2994818749 abstract "Ubiquinone 8 (coenzyme Q8 or Q8) mediates electron transfer within the aerobic respiratory chain, mitigates oxidative stress, and contributes to gene expression in Escherichia coli . In addition, Q8 was proposed to confer bacterial osmotolerance by accumulating during growth at high osmotic pressure and altering membrane stability. The osmolyte trehalose and membrane lipid cardiolipin accumulate in E. coli cells cultivated at high osmotic pressure. Here, Q8 deficiency impaired E. coli growth at low osmotic pressure and rendered growth osmotically sensitive. The Q8 deficiency impeded cellular O 2 uptake and also inhibited the activities of two proton symporters, the osmosensing transporter ProP and the lactose transporter LacY. Q8 supplementation decreased membrane fluidity in liposomes, but did not affect ProP activity in proteoliposomes, which is respiration-independent. Liposomes and proteoliposomes prepared with E. coli lipids were used for these experiments. Similar oxygen uptake rates were observed for bacteria cultivated at low and high osmotic pressures. In contrast, respiration was dramatically inhibited when bacteria grown at the same low osmotic pressure were shifted to high osmotic pressure. Thus, respiration was restored during prolonged growth of E. coli at high osmotic pressure. Of note, bacteria cultivated at low and high osmotic pressures had similar Q8 concentrations. The protection of respiration was neither diminished by cardiolipin deficiency nor conferred by trehalose overproduction during growth at low osmotic pressure, but rather might be achieved by Q8-independent respiratory chain remodeling. We conclude that osmotolerance is conferred through Q8-independent protection of respiration, not by altering physical properties of the membrane." @default.
- W2994818749 created "2019-12-26" @default.
- W2994818749 creator A5015511874 @default.
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- W2994818749 date "2019-12-11" @default.
- W2994818749 modified "2023-10-13" @default.
- W2994818749 title "Cultivation at high osmotic pressure confers ubiquinone 8–independent protection of respiration onEscherichia coli" @default.
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- W2994818749 doi "https://doi.org/10.1074/jbc.ra119.011549" @default.
- W2994818749 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/7039554" @default.
- W2994818749 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/32090977" @default.
- W2994818749 hasPublicationYear "2019" @default.
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